Calendar Events Sort Differently in Firefox vs. IE (ZCS 4.5.11)

I got the following from one of my users:

> > Yesterday morning, our building Director, XXXXXXX, was experimenting
> > with Zimbra Calendaring. She, and others, are considering 'shared
> > calendars' for internal dept. scheduling. So multiple calendars exist and show
> > up as different colors when a monthly calendar is displayed.
> >
> > She had populated our 3 schedules. Viewing them in Internet
> > Explorer 6 vs. Mozilla FireFox produced different results.
> >
> > Under IE6, the multiple events, from multiple calendars, in a single day
> > are in a Sorted order. This is very desirable.
> >
> > Under FireFox 2.0.0.14, these calendar events might not be in sorted order;
> > DO NOT WANT.
> >
> > Have any Zimbra users discovered the methodology to cause FireFox to sort
> > calendar events? Maybe it requires a 'plug-in?'

It seems to me this would have something to do with the differences in Javascript interpreters? I don't imagine there is a code difference other than possible concessions for differences in browser/javascript. Anyone else experienced this?

View they're in at the time? "in a single day" - don't know if that meant day view or just in any view/week/month/etc. (Schedule view is pretty handy.) Screenshots? And gonna upgrade to 5.0.6 sometime?

Basically wondering what the 'sorted' reference means. I remember someone asking how to get them sorted back into columns by calendar (schedule view) but couldn't find that option/we're just clicking on day view.

Or are they saying alphabetical all day events in monthy view vs displaying the all day from one calendar first etc, etc.